UPS Sizing Calculator
Determine the right VA (Volt-Ampere) rating for your Uninterruptible Power Supply (UPS). Perfect for bridging the gap before a standby generator turns on.
Convert Horsepower (HP) to Watts (W) easily. Useful for sizing generators and understanding power requirements.
Power Input
Recommended UPS Rating
Minimum Required: 833 VA
Understanding UPS Sizing
An Uninterruptible Power Supply (UPS) is rated in Volt-Amperes (VA), whereas most electronic equipment is rated in Watts (W). The relationship between the two is defined by the Power Factor (PF).
For sizing a UPS for typical computer and networking equipment, a power factor of 0.6 is commonly used as a safe, conservative estimate.
- Minimum VA = Total Watts / 0.6
- Recommended VA = Minimum VA + Future Expansion Margin (typically 20%)
Note: Higher-end UPS systems (like pure sine wave units) might have a higher power factor closer to 0.8 or 0.9. However, using 0.6 ensures you don't undersize standard line-interactive units.